Berlisensi
- Acorn
- Arthur
- ARX
- RISC OS
- RISCiX
- Amiga
- AmigaOS
- Atari ST
- TOS
- MultiTOS
- MiNT
- Apple Macintosh
- Apple DOS
- A/UX
- ProDOS
- GS/OS
- Mac OS
- Mac OS X
- Apple Darwin
- Be Incorporated
- BeOS
- BeIA
- Zeta
- Digital/Compaq/HP
- AIS
- OS-8
- ITS (untuk PDP-6 dan PDP-10)
- TOPS-10 (untuk PDP-10)
- WAITS
- TENEX
- TOPS-20
- RSTS/E
- RSX-11
- RT-11
- VMS
- IBM
- IBSYS
- OS/2
- AIX
- OS/400
- DOS/360
- DOS/VSE
- OS/360
- MFT
- MVT
- SVS
- MVS
- TPF
- ALCS
- OS/390
- z/OS, Unix-like
- z/VM
- z/VSE
- Basic Operating System
- PC-DOS
- ICT/ICL
- GEORGE
- VME
- DME
- TME
- Microsoft
- MS-DOS
- Microsoft Windows
- Windows 1.0
- Windows 2.0 (untuk 80286)
- Windows 3.0
- Windows 3.1
- Windows 95
- Windows 98
- Windows Me
- Windows NT
- Windows NT 3.5
- Windows NT 4
- Windows 2000 (aka Windows NT v5.0)
- Windows XP (berbasis Windows 2000 secara internal, memiliki banyak edisi: Home Edition, Professional Edition, Starter Edition, 64-bit Edition, x64 Edition, Media Center Edition)
- Windows Server 2003
- Windows Vista
- Xenix
- Windows CE
- Sun Microsystems
- Solaris, Unix-like
- SunOS, Unix-like, (menjadi Solaris)
- Java Desktop System
- OS berhak milik lainnya, Unix-like dan POSIX-compliant
- Aegis/OS
- Cromix
- Coherent
- DNIX
- Digital UNIX
- freeBSD
- GNU/Linux
- HP-UX
- Idris
- IRIX
- Mac OS X
- Menuet
- NetBSD
- NeXTSTEP
- OS-9
- OS-9/68k
- OS-9000
- OSF/1
- OpenBSD
- OPENSTEP
- Plan 9
- Plan 9, Inferno
- Rhapshody
- RiscOS
- SCO UNIX
- System V
- UNIflex
- Ultrix
- UniCOS
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